Hello Experts, Had an urgent query.. What should be the behavior of and STP if it receives a MSU with an unknown SIO? - Should it drop the MSU? - Should it try to route the MSU depending upon the DPC? Can you please point to some excerpt from Q.703 which talks about this? I tried searching the same but could not find anything on this. Thanks in advance. Regards, Prerna -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.digium.com/pipermail/asterisk-ss7/attachments/20110119/8ff91a2c/attachment.htm>